If you would like to sync the SharePoint files that you have been given access to on your computer please do the following:
Login to Office.com with your 365 Email Account
On the left hand side click on the square made of dots at the very top.
Once the APP menu opens click on SharePoint
This will open a new tab with SharePoint.
Click on the Folder you would like to sync.
[ This can be Company Name, Location, etc.. depending on what is being shared ]
Once the files that you would like to sync are displayed click on Sync.
You will get a notification that files are being synced to your device.
Once finished you can find those files on your computer as if they were on a shared network folder.